MAI WORKED HARD , ______ SHE PASSED HER EXAM .A. SO B. ALTHOUGH C....

1. - TRAC NGHIEM VE LIEN TU TIENG ANH
TRAC NGHIEM VE LIEN TU TIENG ANH

1. Mai worked hard , ______ she passed her exam .

a. so

b. although

c. because d. though